Which of the Prophet's daughters was married to Uthman ibn Affan (RA)?
Q1. Which of the Prophet's daughters was married to Uthman ibn Affan (RA)?
Answer: Ruqayyah and later Umm Kulthum (RA)
Explanation: The Prophet (PBUH) first married his daughter Ruqayyah (RA) to Uthman ibn Affan (RA); after her death, he married his other daughter Umm Kulthum (RA) to him, earning Uthman the title "Dhul-Nurayn" (Possessor of Two Lights).